Yealink compatible: yealink wireless wf40 dongle for yealink ip phones; compatible with t27g, t29g, t46g, t48g, t41s, t42s, t46s, t48s, t42u, t43u, t46u, t48u, t52s, t54s, t53Note: your yealink phone may require you to upgrade the firmware; for t48g: upgrade to the v35.80.0.95 or higher; for t29g, t46g, t46s, t48s: upgrade to the v81 or higher; for t27g: upgrade to v69.81.0.90 or higherBundle of 2 items: yealink wifi adapter wireless usb dongle wf50 for yealink phones and global teck microfiber clothGoodbye wires: with the yealink wf40 dongle powerful usb wifi adapter you can avoid running ethernet cables, drilling holes and other pains that come with installing phones; save time, money and frustrations